It was not until the fall of his senior year that Roger completed a design of a solar engine which Dean Erskine was willing to turn over to the University shops, that a model might be made. Roger had taken Ernest into his confidence and that faithful friend undertook to make all drawings for him. Ernest had no originality of mind, but he was an excellent workman and a first class mathematician and laboratory man. Early in January, the model was completed, and on a cold Saturday afternoon, the test was made. Roger and Ernest came home to the Wolfs' for supper deeply discouraged.
"But why wouldn't it work?" asked Elsa, as the boys wiped the supper dishes for her.
"If I knew that, I wouldn't be blue, would I?" grunted Roger.
"I wish I understood the stuff you talk," Elsa went on. "I don't see how on a cold day like this you'd expect to run an engine with heat from the sun."
"We didn't try to," said Ernest.
"Didn't try to!" echoed Elsa. Then she banged the tea kettle angrily back on the stove. "I do think you boys are disgusting! Here I'm so interested in your work and you treat me as if I were a baby! And I'd like to know who does more for you two great hulks than I do. You simply disgust--"
"Hold on, Elsa," roared Roger. "For the love of Mike! I'll confide the inmost secrets of my being to you if you'll stop jawing. Now listen! You can see that we can't get as high temperatures out of the sun's rays as we can out of burning coal or gasolene?"
Elsa, much mollified, leaned against the sink and fastened her violet eyes on Roger's face.
"I understand that," she said.
"Wonderful!" murmured Ernest.
Elsa made a face at her brother and Roger went on with a grin. "So I'm trying first of all to develop a practical, efficient engine that will run with the temperatures I'm able to get from Sun Heat."
"And won't the model work at all? Not a bit?" asked Elsa.
"She just sits and looks at me without moving a muscle," replied Roger.
"Can't the Dean tell you what's the matter?" Elsa ventured.
"The Dean!" snorted Ernest. "Isn't that just like a girl? Why, Roger knows more about low pressure engines in a minute than the Dean'll know in his whole life. Come on, Rog, if you've finished your kindergarten. Let's go up to see Florence King and her bunch at the Beta house. It will rest our brains."
"Not for me," replied Roger. "I've done enough girling to last me a spell. I'll stay here and educate Elsa till she goes to choir practice, then I'm going home and bone on that design."