MISCELLANEOUS FACTS AND FIGURES. 



583 



The Average Velocities of Various 

 Bodies. A man walks 3 miles per hour or 

 4 feet per second. A horse trots 7 miles per 

 hour or 10 feet per second. A horse runs 20 

 miles per hour or 29 feet per second. Steam- 

 boat runs 20 miles per hour or 26 feet per 

 second. Sailing vessel runs 10 miles per hour 

 or 14 feet per second. Rapid rivers flow 3 

 miles per hour or 4 feet per second. A mod- 

 erate wind blows 7 miles per hour or 10 feet 

 per second. A storm moves 36 miles per hour 

 or 52 feet per second. A hurricane moves 80 

 miles per hour or 117 feet per second. A rifle 

 ball moves 1,000 miles per hour or 1,466 feet 

 per second. Sound, 743 miles per hour or 

 1,142 feet per second. Light, 192,000 miles 

 per second. Electricity, 288,000 miles per 

 second. 



Table of the Principal Alloys A 

 combination of copper and tin m akes bath metal. 



A combination of copper and zinc makes 

 bell metal. 



A combination of tin and copper makes 

 bronze metal. 



A combination of tin, antimony, copper, 

 and bismuth makes britannia metal. 



A combination of tin and copper makes 

 cannon metal. 



A combination of copper and zinc makes 

 Dutch gold. 



A combination of copper, nickel, and zinc, 

 with sometimes a little iron and tin, makes 

 German silver. 



A combination of gold and copper makes 

 standard gold. 



A combination of gold, copper, and silver 

 makes old standard gold. 



A combination of tin and copper makes gun 

 metal. 



A combination of copper and zinc makes 

 mosaic gold. 



A combination of tin and lead makes pewter. 



A combination of lead and a little arsenic 

 makes sheet metal. 



A combination of silver and copper makes 

 standard silver. 



A combination of tin and lead makes solder. 



A combination of lead and antimony makes 

 type metal. 



A combination of copper and arsenic makes 

 white copper. 



How to Mix Printing Inks and 

 Paints in the Preparation of Tints. 

 The first named color always predominates. 



Mixing dark green and purple makes bottle 

 green. 



Mixing white and medium yellow makes 

 buff tint. 



Mixing red, black, and blue makes dark 

 brown, 



Mixing bronze, blue, lemon yellow, and 

 black makes dark green. 



Mixing, white, medium yellow, and black 

 makes drab tint. 



Mixing white, lake, and lemon yellow makes 

 flesh tint. 



Mixing lemon yellow and bronze blue makes 

 grass green. 



Mixing white and black makes gray tint. 



Mixing white and purple makes lavender tint. 



Mixing red, black, and medium yellow 

 makes maroon. 



Mixing lake and purple makes magenta. 



Mixing medium yellow and purple makes 

 olive green. 



Mixing medium yellow and red makes 

 orange. 



Mixing white, ultramarine blue, and black 

 makes pearl tint. 



Mixing white and lake makes pink. 



Mixing ultramarine blue and lake makes 

 purple. 



Mixing orange, lake, and purple makes 

 russet. 



Mixing medium yellow, red, and white 

 makes sienna. 



Mixing white and ultramarine blue makes 

 sky blue. 



Mixing ultramarine blue, black, and white 

 makes slate. 



Mixing vermilion and black makes Turkey 

 red. 



Mixing white, yellow, red, and black makes 

 umber. 



Durability of Different Woods. 

 Experiments have been lately made by driving 

 sticks, made of different woods, each two feet 

 long and one and one half inches square, into 

 the ground, only one half an inch projecting 

 outward. It was found that in five years all 

 those made of oak, elm, ash, fir, soft mahogany, 

 and nearly every variety of pine, were totally 

 rotten. Larch, hard pine, and teak wood 

 were decayed on the outside only, while acacia, 

 with the exception of being also slightly at- 

 tacked on the exterior, was otherwise sound. 

 Hard mahogany and cedar of Lebanon were 

 in tolerably good condition ; but only Virginia 

 cedar was found as good as when put in the 

 ground. This is of some importance to Guild- 

 ers, showing what woods should be avoided, 

 and what others used by preference in under- 

 ground work.. 



The durability of wood when kept dry is 

 very great, as beams still exist which are 

 known to be nearly 1,100 years old. Piles 

 driven by the Romans prior to the Christian 

 era have been examined of late, and found to 

 be perfectly sound after a.n immersion of nearly 

 2,000 years, 



