Popular Mechanics Magazine, Volume 34

Front Cover
Henry Haven Windsor
Popular Mechanics Company, 1920 - Industrial arts
0 Reviews
 

What people are saying - Write a review

We haven't found any reviews in the usual places.

Contents

Air Fleet West Coast Navy Establishes
10
Boatmen Expert Large Tourist Trade Light
11
Automobile Washing Solution in Pressure
12
Drainage Tiles Wooden Racks Keep Alined 665
15
Gasoline Seattles Autos Line Up for 379
18
Apparel Itussia Uses Old Upholstery for 587 tached to Car 896
19
Automobile Windshield as Dining Table
20
Lamps Movie Trap Kills Insects Around 507
23
Cigar Perforator Simple 7S7 Clover New Variety Matures in One Season 34
25
Motorcycle Model Is Inch and a Half High 96 Work Shown In Ten Minutes by 31
31
Landing Station Metropolitan for Air Craft 912
34
Automobile Windshield Winn Improved
35
School Children Michigan Pulse Test Shows
36
Patternmaker Small Spokeshave for 134 ords
39
Sheds Huge Navy Builds for Dirigibles 85S ShipSteamer New Orleans Built in Prai
40
Motorcycle Policeman Tags Autos without Moving Pictures Thousands per Second
45
Lantern Railway Gatemans Shows Red
52
Irrigation System Automatic by V
54
Gastropoda Old Buggy Motorized 406
58
Houses Group of like Toy Paper Village 320
69
Automobile Woman Held under Water
70
Railroad Ditching Machine Battery Wells lized with 71
71
Pier Railing Lower Pipe of Has Water
72
Casts Plaster Finish for 131
74
Steam High Pressure Small Tractor Driven
75
ReligionVoluntary Flagellation Practiced
78
Apple Peeler Turned by Crank 114 Auditorium Huge Dedicated at Chautauqua
79
Clamp Aids in Tapping Drilled Holes 927 Coal Shortage Swiss Water Power Devel
82
Drawing Board for Office Desk 286
84
Orchards Apple Reducing Culls in 474
85
Steam Joints Babbitt Packing for 448
91
Chain Attachment Helps in 929
92
Drawing Perspective Swinging Rule for 606
95
Ordnance Research Engineer Wanted
97
Signal Continuous Distress Automatic
102
Hulls Boat Building Models of 476
103
Engine Big Takes Place of Wrecked Bridge 731 Carry to Hoosiers
104
Comb Foundation Economy in 767 Concrete Replica of Old Oaken Bucket
108
Gauge for Setting Lathe Tool 608
112
Camper Frying Pan with Folding Handle
114
Plunger Salt Cellars Flow Regulated by
115
Oyster Hatchery Centrifugal Force Used by 826
116
Silo Canvas Water Tank Prevents Rotting
117
Automobilists Arm Length Gloves Protect
119
Boiler Locomotive Type Studying Water in in Snort Courses 159
120
Protractor Using the 781
125
Derby Air Course of Mapped 756
126
Steam Valve in Pot Lid
127
Pocket under Theater Chair Holds Wraps 817
128
Grasshopper Plague Turkeys Control 669
132
Boilers Slow Steaming Auxiliary Draft for 168 Brake and Scutcher Combined for Flax
133
Classes College Professor Conducts by Stretcher
134
Bomb Largest Aerial Weighs 3000 Pounds 730 Brass Packing Nuts Tool for Making
140
Pulley for Tov Machinery 313
141
Hunters Federal Rid Texas of Predatory
143
Designs Ornamental Seeds Make 476
145
Resistor Units Lamp Banks for Charging
150
Tap and Reamer Wrench Improved 93S Tent Screen Door for
155
Bomb Toothpicks Make 310 Brass Tarnished Oxalic Acid Cleans 447
157
Gauge Tire Valve Stem Inside Pressure
159
Catamaran Air Propelled Has Auto Body
161
Bridges National Parks Armys Surplus
169
Gratings Linemen on High Tension Poles
173
Motorists New Modified Lever Jack for 871 Mullet Fisheries of the Salt on Sea by John
175
Hvdroelectrtc Development Japanese High
179
Highway Concrete Built Half at Time 890
181
Packing or Gaskets None in New Faucet 602
182
Combustion Gaseous Vortex Basis of 751 Concrete Ship Cement Gun Patches
184
Milk Pail Nonspill Valve and Sieve in Top Monoplane All Metal 1400Mile Nonstop
188
Automobilists Changeable Signboard Maps
190
Armor Ancient Secret of Known 840 places 53
193
Gear Speed Reducing Adds to Uses of Small
194
Automobilists Pavement Signs Warn 492
197
Island Luzon Ancient Wheels for Irriga
198
Community Chest Monster Cincinnatus Concrete Ship New Type with Thin Walls
201
Library Books Travelers Want InterCity Lock Reliable Auto Ignition 621
202
Pump Electric Submersible for Salvaging
203
otroyer Modern Gift of Philippines
208
torical Air Craft to be Displayed by
211
Camphor Twigs Cut without Injury
214
Beer Alcohol and Sugar Bullrushes Yield
215
Gears Rawhide Storing and Running 020
216
Resort Beach Monster Elephant Form of 393
217
Tin Snip Shears Attachment Makes of
219
Canal New Italy Rlasts to Increase Fish
222
Aviator Ornlthroptor Makes Heal Bird man 846
223
Air Line Long South American Contract
224
Beeswax Applied in Cutting Wood Threads 145
226
Grave Empty Statue of American Soldier
230
Canal to Ocean Sheffield England Asking
231
Dfstrover Satterlee New American Speed
233
Fleet Maneuvers Kite Balloons Conspic Forest Fire Fighters Feeding by Wallace
234
Police Boat New York Citys New Flag
238
Detours Arrows Mark on Iowas Highways 917
239
Air Pump through Bottles for Analysis
240
Canal Zone Panama Many Quakes Yearly at
242
Mall Parcel Post Machinery being Shipped
245
Dial New Clock Watchmaker Advocates 277
246
Bell Shaped Holders Wooden for Clocks 586
248
Engine Cooling Hose Clamp Limits 928 Exhibition 111Fated Night Photos Show
251
Tip Up for Winter Fishing 952
256
Rest Handy for Hot Soldering Iron 287
259
Pump Packing Bacon Rind for 461
260
Gravel Screen Revolving Cams Agitate
263
Mail Planes Coast to Coast Omaha Base of 16
265
Steam Water Heater Mercury Expansion
267
Island Majorca Is Garden Spot 096
270
Army Aeroplane Flight to Nome Successful 511 ping
271
Air Route 10 Hour to Link United States
273
Canary Bird Large Funeral for 920
275
Pavements Tumbling Machine Tests Bricks Phonograph Reproducer Auxiliary Dia
277
Engine Cylinders Auto Portable Appliance Explosion Oil Tank Ship Proves Disastrous 840
281
Grease in Wool Recovery Sought 368
282
Guard Rails Hemispherical Joints for Con
289
Manufacturers British Plan Floating
290
Railroad Lines Holland and Belgium to Reamer Guided Pipe and Conduit Threads
291
Tire Casing Automobile Swing Made from 125
294
Awning Quickly Made
301
Catamaran Motorcycle Power
303
Tire Old Tool Pouch Made from
305
Guard Truck Radiator Protects Vulnerable
307
Belts Rawhide Joining 453
311
Steam Widening Pipe like Funnel Dead
317
Gift from Philippines to United States
319
Scientists Coffee and Its Effect Study of 570
322
Restaurant Owner Plane Carries on Inspec
324
Air Screw and Engine Queer Houseboat
332
Gum Chewing Benzine as Remover for 794
334
Restaurant Patrons Prison Cells Dining
335
Compass Toy Made from Old Scissors 155 Condenser Wireless for Emergencies 793
338
Roofing Prepared Applied like Shingles 944
339
Oun Carnival Confetti and Corn Thrown by 395
340
Army Airplane Largest Passes Official Test 217 Automobile Brush Midget Turbine Whirls
344
Scrapers for Wood Finishing Plane Bits as 765
347
Gun Stock Carrying Matches in 950
348
Cataracts near Portland Oregon Recently
349
Mine Disasters Planes to Carry Rescuers to 492 Monument Brazilian Independence Com
352
Tire Valve Stem Gauge on Tells Inside
353
Paint on Walls Protecting from Dirt 775
357
Eagle Baldheaded Salmon Bests In Battle 74 7
361
Docks Large Hoppers Facilitate Unloading
365
Tissues Muscular of Cattle Artificial Silk
366
Tee Pipe Needle Valve Built in 956 Theft Sailors Charged with Tried at Ships
371
Steamer Ocean Collides with Log Raft 222
375
Bags Machine Turns 2500 Inside Out
378
Toadstool Concrete Garden Ornament 109
381
Bags Valve Tvpe Cement Special Machine
385
Floats Leaky In Tanks Repairing of 318 Forest Products Laboratory Big Testing
387
Manure Liquid How to Use 774
394
Compressed Air Granite Blasted with 658 Confetti Carnival Gun Throws
395
Shake United States In 1919 7
398
Paint Pigments Mineral Vast Stores
399
Cattle Barn Huge Holds Thousand Head 672
401
Balance without Springs or Bearings 158
403
Screen Gravel Revolving Cams Agitate 263
404
Navy Dirigibles to Chart Pacific Coast Line
407
Highway Signs Map Danger Points
408
Cavern Roof Hole In Catches Water from
409
Truck Fitted as Repair Shop for Planes 381 Tunnels and Sea Walls Atomized Con
410
Maps Contour Survey Makes in Mountains
411
Peat Excavator 700 Tons per Day Dug by 812 Airplane 727
415
Concrete and Rock Setting Bolts in 776 Conservatory Famous Explosives Destroy
420
Root Cellar under Driveway 772
421
Army Cloth American Paris Taxicabs Up Automobile Bumper Hooks on Make Tow ing Easy
424
Garden Formal Stone and Concrete Bridge
429
FloodWeights on Oil Tanks Avert Dan Found on Tree by
430
Maps Forest Aeroplanes Make in Autumn 900
432
Ceda r Chest Tiny Scents Clothes Closet 914
433
Bonfire Bent Pipe Is Water Heater for Use Bread and Milk Deliveries Box for 637
435
FlowersCage Orchids to Prevent Theft of Fossil Remains Significant Found In West
439
Concrete Bumpers Ornamental at End of Contest Kite Flying in Hawaii
440
Speed Counter Hand Drill as 136 with
444
Highways Tractor Snowplow Clears 659
445
Electric Heat Small Regulator Controls 603 ElectricityOhms Law Recently Verified 338
447
Mine Lofty Mile Long Cable Only Approach Mosquito Netting is Screen Door Substitute
451
Toggle Press Small for Bench 300
456
Screw Faceplate Rapidly Actuated 617
457
Fence Iron Ore Farmer Builds around Fires Forest Nonsmoldering Gun Wads
458
Hinges Double Acting Spring Making 951
461
Toll Bridge in Texas Oil Fields Business
462
Screwdriver for Close Quarters 289
463
Automobile Equipment Fits for Winter Automobile Plane and Polo Contests
479
Air Velocity Attachment for Dirigibles
482
Engine Efficiency Miles per Gallon Auto Exploration Arctic Tractor to Figure in
483
Navy Flying Boats Radio Compass
485
Reunions OutlandersV Bulletin Board
487
Pi rews and Wlngnuts Homemade 951
489
Sterilizer New for Pair of Toothbrushes 28
492
Porcelain New Has Properties of Glass 917
493
Concrete Cattle Dipping Vat 552 to Complete in 159
494
Penitentiary Model Illinois Now Has 855 zontallv
498
Fertilizer Sumatran Water Power to Make 23 Fish Salmon Returned Soldiers Bottling 345
499
Jenkins Paul A
501
Rope Worn Out Wire Reinforces Concrete
510
Hog Chute Stock Farmer Mounts on Wheels 264
518
Roundhouse Locomotive Plunges through
520
Post Office Clock Wooden to Replace Iron
521
Radio Message One Wire Aerial Receives
522
Paint Remover Chloroform as 629
526
Rubber Filling Out Holes in 299
529
Moving Picture Machine Small Has Pictures Musical Instruments Violin Bridge Metal
530
Fluids Two Nozzle Mixes 432 print on
532
Rule Folding Attachment Makes Versatile
539
Percolator Coffeepot Converted into 624 graphed by A Swanson
542
Air Water Robs of Oxygen and Lights
558
Jet Principle Hydraulic Propeller Utilizes
567
Buckle New Infantry Pack is Adopted 905
573
Hogs Trap Catches and Holds Tightly 64
577
File Drawers Bumper Protects 2S3 Fisheries Company Largest Radio Station
579
Navy Huge Sheds for Dirigibles Built by 858
580
Revolution Counter Useful in Coll Winding 628
584
Painter Sign Letters Cut in by 763
585
Radio Receiving Set Small Has Direction
586
Filter Intake for Tractor Wet Sponge Basis Fishing Inverted from Submarines by John
591
Navy United States Openings for Civil
592
Airdrome Sites Located for CrossCanada
596
Army Equipment High School Makes 2G5 Automobile Bumper Lock
600
Tool Holder Saves High Speed Steel
604
Rule Swinging for Perspective Drawing
606
Flume Salt riant Sea Foam Lather Rises Fountain Brush Special Typewriters
611
Jig for Bending Eyes in Wire 455
612
Hoisting Machine LampPosts Alined by 878
617
Pipe Furnace Engine Exhaust Carried
620
Joint Pipe Emergency 936
621
Electric Induction Water Heater 130 ElectricityRelay Polarized Construction of
623
Clay Cells Verdun Relics Put in by Huns 427 Coffeepot Percolator Made of
624
Speed Trap Roadside Sign Warns Motorists Squeegee Plate Celluloid
628
Joints Hemispherical for Guard Rail Con
629
Flytrap Odd Keeps Cows Contented 913 Frame Ornamental Wire f jr Pie Pan 590
631
Airdrome Tower for Oil Drums 543
633
Candle and Funnel Experiment
635
Richeson Major A B
641
Tool New Welding for Holding Small Bars 40
649
Engine Exhaust Furnace Pipe Carries Off 620 by 353
652
Army Rifle New Trigger tor 822 Automobile Casing Knee Pads Made of 797
654
Rink Hockey Arrangement of 954
659
Candv Tree Indian Yields Fairy Fruit
670
Building Twelve Mile Ocean Voyage Taken
671
Holder Improved for Admission Ticket
672
Airmen Hidden Stills in Iowa Found by 900
674
Engine Portable Light Roof for 467 Property in New York
675
Concrete Driveway Steps and Gutter Com Hill Removed by
678
Navy West Coast Air Fleet Established by 844
681
Palm Houses Thatched Replace Tent Cot
684
Homes Odd Built for Section Hands
692
Engines Aero Drive Pumps and Dynamos 693 Eyes Metal Fixed to Logs for Downstream
694
Safe Lead Case in Contains Radium
696
River Delaware Life Jacket of Lusitania
699
Life Limiting Conditions of in Tropics 520 Crown and Sides of
701
Safetv Campaign One Week Proves Highly
704
Radio System Compact on Sidecar
706
Cabin Luxurious Woodsman Builds
714
EducationOdd School Mixes Practical
716
River Junction Dike Guards School at 734
717
Truck Hand Hinged Legs Permit Stair Tunnels Mountain Carry Irrigation Water
729
Envelopes Examining for Inclosures 289 and Barrel 336
731
Safetv Committee Workers Inspects Plant
736
Cabinet for Long Horn of Phonograph
752
Truck Wheels Movable Crane for Garage Typewriters Special Fountain Brush Cleans
753
Lighting Set Farm Small Tractor Drives 700 Loom Manual Training Class Makes
761
Hood Auto Engine Varnishing
779
Automobile Explorer in Learns Antelopes Automobile Plumb Bob Indicates Position
784
Cane Chair Seat Tightening
787
Electric Lamp Shade Adjustable 933 ElectricityRelay Slow Acting How
790
Army Surplus Steel National Park Bridges Automobile Cleaning with Sprayer and
797
Filter Simple Monochrome 151 FishingMinnow Trap Made from Keg 148
798
Education Postgraduate Study Allowed
799
Radiotelephone Portable Compact
804
Automobile Garage Door Closed by Passage Automobile Road for Railroad Snowsheds
805
Cabinet Phonograph Small Model of Built
814
Netting Poultry Applying Properly 478
818
Automobile Generators Testing 430 Automobile Running Gear without Frame
820
Cabinet Radiant Therapy Produces Good
822
Automobile Hub as Lathe and Drill Press 456 Coach 561
829
River Lock Serves as Drydock 202
831
River Oriental Floating Docks Overcome
837
Envelope Sealer Has Double Rollers 251 Fan Electric Has Heating Unit
838
Hoofs Muffled for Horses Safety 936
841
Articles Lost Glass Case in Bar Harbor Automobile Covered Camping Bed In Rear
842
Spillways Concrete Protect Railroad Right Stadium Western Build by Odd Hydraulic
870
River Railway Uses as Link between
873
Eraser Ink Steel Wool as 157 Farm General Purpose Hod for 461
876
Eels Spawning Comb Sea Depths to Solve
878
Spindles Horizontal Double on Counter Has 373
894
Canneries Tomato Grading Machine for 652
895
Miners Mountain Sheep Killed tor Horns by 414 Breaks
896
Railroad Ties Unbalanced Motor Shaft Refiner American Big Pump and Turbine
899
Horn Cows Drinking Cup Made from 144
903
Cadmium Substitute for Zinc in Galvaniz
904
Food Chopper Made from Saw Blade 157 rectly Into
906
Horn Phonograph In Cabinet 752
913
Book Ends Have Electric Lamp Attachments 115 Bread Dough Electric Lamp Raises 157
914
Cadmium Vapor Arc Pure Red Attained 752
915
Fingers on Automatic Hand Function In Lost in Oil Wells
916
Playing with
921
Spirit Board New Shaped like Ruler 753 Stain Yellow Removing from Rubber
928
Cap for Deflating Inner Tubes
939
Pergoda Pillar Bricks Omitted to Make PhotographyHolder for Developing
952
Caprlfig The Romance of bv I P Craw
953
Trucks Gauge Destructive Impact on Pave Uniform Ruttons Repairing
955
Newspapers Slot Machine Sells 858
958
Mines Water Vibration System Furnishes Motion by
1
Car Tracks Spring Thaw Drops Bowlders on 3
3
Nozzle High Pressure One Man Controls 824
4
Clay Sewer Pipe Vitrified Sanitary Closet of 456 mitted by 5 17
5
Kite Flying Contest in Hawaii 440
7
Automobile Ladder Dangling from Plane Automobile Stall Individual Motorist Given
8
Perspective Swinging Rule Aid in Drawing PhotographyMaking Photographic Name
9
Food Chopper Putty Worked Over with 318 Freight Motor Truck Union Depot for
10
Cleaner Windshield Electrically Heated 904 Coin Box Telephone Special Alarm Catches
14
Models Paper Student Architects Make 392 Motor Trucks Hobo Earns Expenses
17
Nozzle SelfPropelled Hose Sewers Cleaned
22
Trunk Wardrobe with Ironing Board At Universitv of Illinois Safety First Club
25
Artists Island In Lake Como Retreat for 270 No Attention
31
Carburetor
34
Radium Bank Issues to Hospitals 38
38
Clinics Portable Care for Citys Young 414 Coinage New 500000 Half Dollars to Mark
45
Carpenter Folding Scaffolding Support
54
Automobile Parking Space Church Rents 380 Works from 59
59
roving Pictures Four Reel Story of Pe Francisco Bay 64
64
Automobile Parking Vacant Lot Subdivided Automobile Trouble Lamp How to Keep
67
New Londons Subway
68
MoneyDecimal Coinage System British Chassis of 71
71
Lightning Flock of Sheep Butchered by 370 Lot Vacant Stalls on for Auto Parking 72
72
Fire Drillmaster Electric Horn Used by 903 hibit Building Built around 73
73
239
76
Oil Sealed Internally SuperVacuum itW11
78
Astronomers Blandford Clock Sought by 192 pliance Rebores
79
Bookcase Desk and Filing Cabinet Com Brick and Concrete Combined In Boulevard
82
Cartridge Fuses Tool for Handling 302
84
Blectric Light Used for Examining Mail for ElectricityShort Circuit Makes Honest
86
ConcreteExcess of Cement Used with Wet Job
93
Sponges Tanning Increases Strength of 358 Stamper Machine Characters Made In Soft
99
Boom Detachable Pile Driver Converted to Fit Tree Trunks 108
108
Asylum Insane Tower on Rivers Edge Automobile Engine Speed Varies Mixture
117
Fire Hydrant with 3 8 Hose Connections 396 Flashlight Electric Navy Ship Rescue
122
Ether Puzzle The Two Sides of by Rogers Farm Workers Cool Water for 124
124
Footbridges Two for Farm 286 Fruit Fairy Indian Candy Tree Yields 670
125
Egg Beater Paints Mixed with 127
127
Phonograph Alarm Clock 947 idescent Marks on
131
47
134
140
140
Cake Tin Removable Cover for 274
141
rhonograph Four Pound Plavs Largest PhotographyShotgun Camera Aided by
145
Radium Kept In Lead Case in Safe 69fi
149
Phonograph Lawyer Records Will on 762 Snapping Moving Objects 339
151
Electric Pump Campers Furnished with by 356
152
Gas Natural Government Booklet Tells
159
I
166
Camera Bellows Detecting Pinholes In 453
186
Camera Movie Small Gear Box Speeds Up 119
193
Concrete Fence with Flowerpots 108 played by 197
197
Eggs Artificial Shell Preserves for Weeks 707
198
Boundary Alaska Reestablished4xs crete by Hjalmer Llndiuist 31 Bridge Stone and Concrete in Garden 429
207
Label Watch Crystal Daylight Saving Time
208
Sport Aquatic Race for Free Lunch Is SSS Standpipe How to Deaden Noise of Steam
213
Concrete Floor for Garage 302 Conveyor Novel Stone Barge Unloaded by 215
215
Boat Aquariums Hundreds of Fish Caught
218
Excavation Herculaneum May be Resumed 276 ments 566
220
Camp Cheap Portable Phonograph for 463
221
Raft Log Ocean Liner Collides with 222
222

Other editions - View all

Common terms and phrases

Popular passages

Page 501 - Alaska not to exceed in the aggregate one thousand miles, to be so located as to connect one or more of the open Pacific Ocean harbors on the southern coast of Alaska with the navigable waters in the interior of Alaska, and with a coal field or fields so as best to aid in the development of the agricultural and mineral or other resources of Alaska...
Page 503 - It under the circumstances. The road has not been built as soon as expected because each year we have exhausted our appropriation before the work contemplated had been done. We could not say in October of one year what the cost of anything a year or more later would be, and we ran out of money earlier than anticipated. It has not been built as cheaply as expected because it has been built on a rising market for everything that went into its construction — from labor, lumber, food supplies, machinery,...
Page 501 - Alaska, and with a coal field or fields so as best to aid in the development of the agricultural and mineral or other resources of Alaska, and the settlement of the public lands therein, and so as to provide transportation of coal for the Army and Navy, transportation of troops, arms, munitions of war, the mails, and for other governmental and public uses, and for the transportation of passengers and property...
Page 886 - ... of Framingham was made after several months' study of numerous communities of similar size in various parts of the United States, but particularly in Massachusetts and New York State. Framingham recommended itself to the committee because it possessed certain average qualities, being an industrial community, with mixed industries, varied racial groups, a good local health organization backed up by an excellent State Department of Health, a normal amount of disease, particularly tuberculosis,...
Page 325 - ... which she has photographed for use in her publications. She has likewise adopted the method of tone photographs designed by Dr. Dayton C. Miller, of the Case School of Applied Science, Cleveland, Ohio.
Page 320 - TN accordance with the editorial policy of this magazine never to accept compensation in any form * for what appears in our reading pages, and also to avoid all appearance of doing so, we are obliged to omit the name of the maker or the seller of any article described. This information, however, is kept on file and will be furnished free, by addressing Bureau of Information, Popular Mechanics Magazine, Chicago. (Editor...
Page 608 - Gauge for Setting Lathe Tool A handy gauge to be used on the lathe tailstock for setting the tools, is shown in the drawing. It is a great timesaver when a number of pieces of the same kind are to be made, and it saves the cost of more expensive gauges, where the pieces are not held to very close limits. As shown, it consists of a steel ring, ground to a fit on the tailstock sleeve, with holes drilled cos radially around the circumference, into which are driven the rods used as gauges.
Page 739 - This Is the first wireless message to be heard around the world, and marks a milestone on the road of scientific achievement.
Page 136 - ... slide is curved, to conform to the furnace, and the sides are turned under to fit into the grooves provided, as shown in the drawing. When the furnace is to be used for reducing the temperature of the house, an electric fan is set in front of the opening at the bottom of the furnace; the current is turned on, and the cool air of the basement is forced into the upper rooms, making the reduction in temperature quite noticeable.
Page 29 - Johns, the mining engineer, and is said to be the only one of its kind in use in this country.

Bibliographic information