[a], [b], [c], [d], [e], [f], [g], [h], [j], [l], [m], [n], [o], [p], [r], [s], [t], [v], [w].

airplane duster, [26]
asphalt spreader, [65]
bailer, [34]
baler, automatic, [26-27]
beet digger, [42]
bit, [69]
blower, [28]
boom, [9], [49], [51], [55], [74], [85]
“box seat,” [22]
bucker, [53]
bulldozer, [45], [55], [57], [61], [67], [74], [77]
bull wheel, [73], [74]
cable rig, [72]
catcher, [53]
caterpillar, [45], [46], [60], [67], [68], [74], [77], [85]
cats, [68]
cement mixer, [65]
chicken picker, [24-25]
Chinese drillers, [73-74]
chisel plow, [32]
clamshell, [49], [84]
coal digger, [81]
coal loaders, [81]
coal mining, [9], [78-83]
corn cutter, [25]
corn picking machine, [21]
corn planter, [19]
cotton picker, [37-38]
cotton planter, [37]
crane, [10], [49-52], [54], [85]
crawler tractor, [45]
crawlers, [10], [48], [49]
crowd shovel, [49]
“cub” tractor, [44]
cultivator, [21]
cutter heads, [15]
cutting head, [81]
cyclone, [39]
derrick, [69]
Diesel engine, [47]
dipper, [49]
“dogging,” [52]
dredges, [14-15]
driller, [72]
driverless plow, [32-35]
earth mover, [58]
egg machinery, [24]
egg sorter, [24]
electro-magnet, [84]
escalators, [83-84]
farm machines, [18-45]
giraffe, [83]
go-devil, [77-78]
gooseneck trailer, [48]
grader, [61-64]
grass planter, [26]
harrow, [18]
hay baler, [26-27]
hay blower, [67]
hay rake, [27]
hay stacker, [28-29]
heater, [53]
hoe, compressed air, [36], [37]
“hot-dope gang,” [74]
house, [49]
house moving, [58]
jackhammers, [12]
jib, [52]
joint, [70]
lumbering machinery, [85-86]
magnet crane, [84]
“making hole,” [72]
manure scoop, [24]
mechanical mouse, [89]
milking machine, [29-32]
mining, machinery [78-83]
motor grader, [61-64], [67]
motor scraper, [57]
mowing machine, [26]
Muskeg schooner, [69]
nut harvester, [41]
oil wells, [69-74]
ore unloaders, [84]
overhead crane, [10]
package job,” [22]
piggy-back crane, [10]
pile driver, [13]
pipelines, [74-78]
plow, [17], [18], [32], [33], [34], [35]
post-hole digger, [16]
potato digger, [42]
powder monkey, [60]
power shovel, [47-48]
pull-shovel, [49]
pumps, [78-80]
reaper, [22], [42]
rig, [70]
ripper, [61]
rivet gun, [53]
rivet man, [53]
road building machines, [55-68]
rock crusher, [12]
rock rake, [60]
rotary rig, [72]
rotolactor, [30-32]
roughnecks, [72]
scraper, [61]
seed planter, [67]
shovel, [9], [47-48], [49]
signals, [52], [84], [88]
silage blower, [26]
skull cracker, [54]
snow plow, [45], [67]
spraying machines, [38-39]
spud, [15]
squeezer, [89]
steam engines, [80]
steam roller, [66]
steam shovel, [47-48]
suction dredge, [57]
tandem roller, [65]
tassel picker, [40-41]
television, [88], [89]
“thinking machines,” [89]
tomato planter, [22]
tongs, [70]
tractor, [17], [18], [44], [45], [58], [61]
trailer houses, [69]
tree-dozer, [17]
tree-shaker, [41]
trencher, [74-77]
turntable, [51]
turtle, [89]
two-gang plow, [18]
vacuum unloaders, [84]
welding crew, [74]
well drilling, [69-74]
wheat planting machine, [22]
windrower, [27]
wrecker, [54]

The author and the artist wish to thank the following for their help in making this book possible: Miss Elsie Eaves, Manager, Business News Department, Engineering News-Record; Margaret Gossett; Mr. Harold Spitzer; The Lamp, published by the Standard Oil Company (New Jersey); the Caterpillar Corp.; the General Motors Corp., the New Jersey Bell Telephone Co.; the Florida Land Clearing Equipment Co.; the Walker-Gordon Laboratory Co.; the many manufacturers of digging, road-building and other specialized machines; a bumper crop of tractor and farm implement makers; and farmer friends who proudly showed their equipment in action.


$1.50

MACHINES
AT WORK

By Mary Elting

Illustrated by Laszlo Roth